A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "ssl_local.h"
int ssl3_do_change_cipher_spec(SSL *s)
{
int i;
if (s->server)
i = SSL3_CHANGE_CIPHER_SERVER_READ;
else
i = SSL3_CHANGE_CIPHER_CLIENT_READ;
if (s->s3.tmp.key_block == NULL) {
if (s->session == NULL || s->session->master_key_length == 0) {
/* might happen if dtls1_read_bytes() calls this */
ERR_raise(ERR_LIB_SSL, SSL_R_CCS_RECEIVED_EARLY);
return 0;
}
s->session->cipher = s->s3.tmp.new_cipher;
if (!s->method->ssl3_enc->setup_key_block(s)) {
/* SSLfatal() already called */
return 0;
}
}
if (!s->method->ssl3_enc->change_cipher_state(s, i)) {
/* SSLfatal() already called */
return 0;
}
return 1;
}
int ssl3_send_alert(SSL *s, int level, int desc)
{
/* Map tls/ssl alert value to correct one */
if (SSL_TREAT_AS_TLS13(s))
desc = tls13_alert_code(desc);
else
desc = s->method->ssl3_enc->alert_value(desc);
if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have
* protocol_version alerts */
if (desc < 0)
return -1;
if (s->shutdown & SSL_SENT_SHUTDOWN && desc != SSL_AD_CLOSE_NOTIFY)
return -1;
/* If a fatal one, remove from cache */
if ((level == SSL3_AL_FATAL) && (s->session != NULL))
SSL_CTX_remove_session(s->session_ctx, s->session);
s->s3.alert_dispatch = 1;
s->s3.send_alert[0] = level;
s->s3.send_alert[1] = desc;
if (!RECORD_LAYER_write_pending(&s->rlayer)) {
/* data still being written out? */
return s->method->ssl_dispatch_alert(s);
}
/*
* else data is still being written out, we will get written some time in
* the future
*/
return -1;
}
int ssl3_dispatch_alert(SSL *s)
{
int i, j;
size_t alertlen;
void (*cb) (const SSL *ssl, int type, int val) = NULL;
size_t written;
s->s3.alert_dispatch = 0;
alertlen = 2;
i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3.send_alert[0], &alertlen, 1, 0,
&written);
if (i <= 0) {
s->s3.alert_dispatch = 1;
} else {
/*
* Alert sent to BIO - now flush. If the message does not get sent due
* to non-blocking IO, we will not worry too much.
*/
(void)BIO_flush(s->wbio);
if (s->msg_callback)
s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3.send_alert,
2, s, s->msg_callback_arg);
if (s->info_callback != NULL)
cb = s->info_callback;
else if (s->ctx->info_callback != NULL)
cb = s->ctx->info_callback;
if (cb != NULL) {
j = (s->s3.send_alert[0] << 8) | s->s3.send_alert[1];
cb(s, SSL_CB_WRITE_ALERT, j);
}
}
return i;
}